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Chai, L. (author), Al-Sawai, W. (author), Gao, Y. (author), Houtepen, A.J. (author), Mijnarends, P.E. (author), Barbiellini, B. (author), Schut, H. (author), Van Schaarenburg, L.C. (author), Van Huis, M.A. (author), Ravelli, L. (author), Egger, W. (author), Kaprzyk, S. (author), Bansil, A. (author), Eijt, S.W.H. (author)Positron annihilation lifetime spectroscopy and positron-electron momentum density (PEMD) studies on multilayers of PbSe nanocrystals (NCs), supported by transmission electron microscopy, show that positrons are strongly trapped at NC surfaces, where they provide insight into the surface composition and electronic structure of PbSe NCs. Our...journal article 2013
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Al-Sawai, W. (author), Barbiellini, B. (author), Sakurai, Y. (author), Itou, M. (author), Mijnarends, P.E. (author), Markiewicz, R.S. (author), Kaprzyk, S. (author), Wakimoto, S. (author), Fujita, M. (author), Basak, S. (author), Lin, H. (author), Wang, Y.J. (author), Eijt, S.W.H. (author), Schut, H. (author), Yamada, K. (author), Bansil, A. (author)We have observed the bulk Fermi surface (FS) in an overdoped (x=0.3) single crystal of La2?xSrxCuO4 by using Compton scattering. A two-dimensional (2D) momentum density reconstruction from measured Compton profiles yields a clear FS signature in the third Brillouin zone along [100]. The quantitative agreement between density functional theory ...journal article 2012
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Barbiellini, B. (author), Koizumi, A. (author), Mijnarends, P.E. (author), Al-Sawai, W. (author), Lin, H. (author), Nagao, T. (author), Hirota, K. (author), Itou, M. (author), Sakurai, Y. (author), Bansil, A. (author)We have studied the [100]-[110] anisotropy of the Compton profile in the bilayer manganite. Quantitative agreement is found between theory and experiment with respect to the anisotropy in the two metallic phases (i.e., the low temperature ferromagnetic and the colossal magnetoresistant phase under a magnetic field of 7 T). Robust signatures of...journal article 2009